Question

why animals are only hetrotrophs instead of plants?​

Answer 1

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All heterotrophs have an absolute dependence on the biological products of autotrophs for their sustenance—they have no other source of nourishment. All animals are heterotrophs, as are most microorganisms (the major exceptions being microscopic algae and blue-green bacteria).

Answer 2

All heterotrophs have an absolute dependence on the biological products of autotrophs for their sustenance—they have no other source of nourishment. All animals are heterotrophs, as are most microorganisms (the major exceptions being microscopic algae and blue-green bacteria).